diff --git a/README-zh.md b/README-zh.md
index cbab6f7..7563edf 100644
--- a/README-zh.md
+++ b/README-zh.md
@@ -53,12 +53,12 @@ wget https://git.io/vpnsetup -O vpnsetup.sh && sudo sh vpnsetup.sh
- 封装所有的 VPN 流量在 UDP 协议，不需要 ESP 协议支持
- 可直接作为 Amazon EC2 实例创建时的用户数据使用
- 包含 `sysctl.conf` 优化设置，以达到更佳的传输性能
-- 已测试： Ubuntu 18.04/16.04/14.04, Debian 9/8 和 CentOS 7/6
+- 已测试： Ubuntu 18.04/16.04, Debian 9/8 和 CentOS 7/6
## 系统要求
一个新创建的 Amazon EC2 实例，使用这些映像之一：
-- Ubuntu 18.04 (Bionic), 16.04 (Xenial) or 14.04 (Trusty)
+- Ubuntu 18.04 (Bionic) or 16.04 (Xenial)
- Debian 9 (Stretch) or 8 (Jessie)
- CentOS 7 (x86_64) with Updates
- CentOS 6 (x86_64) with Updates
diff --git a/README.md b/README.md
index 8cabc72..b0cae9b 100644
--- a/README.md
+++ b/README.md
@@ -53,12 +53,12 @@ For other installation options and how to set up VPN clients, read the sections
- Encapsulates all VPN traffic in UDP - does not need ESP protocol
- Can be directly used as "user-data" for a new Amazon EC2 instance
- Includes `sysctl.conf` optimizations for improved performance
-- Tested with Ubuntu 18.04/16.04/14.04, Debian 9/8 and CentOS 7/6
+- Tested with Ubuntu 18.04/16.04, Debian 9/8 and CentOS 7/6
## Requirements
A newly created Amazon EC2 instance, from one of these images:
-- Ubuntu 18.04 (Bionic), 16.04 (Xenial) or 14.04 (Trusty)
+- Ubuntu 18.04 (Bionic) or 16.04 (Xenial)
- Debian 9 (Stretch) or 8 (Jessie)
- CentOS 7 (x86_64) with Updates
- CentOS 6 (x86_64) with Updates
diff --git a/docs/clients-zh.md b/docs/clients-zh.md
index f75d0ac..2647825 100644
--- a/docs/clients-zh.md
+++ b/docs/clients-zh.md
@@ -167,7 +167,7 @@ VPN 连接成功后，网络状态图标上会出现 VPN 指示。最后你可
### Ubuntu Linux
-Ubuntu 18.04 （和更新版本）用户可以安装 network-manager-l2tp-gnome 软件包，然后通过 GUI 配置 IPsec/L2TP VPN 客户端。Ubuntu 16.04 和 14.04 用户可能需要添加 `nm-l2tp` PPA，参见 这里。
+Ubuntu 18.04 （和更新版本）用户可以安装 network-manager-l2tp-gnome 软件包，然后通过 GUI 配置 IPsec/L2TP VPN 客户端。Ubuntu 16.04 用户可能需要添加 `nm-l2tp` PPA，参见 这里。
1. 进入 Settings -> Network -> VPN。单击 **+** 按钮。
1. 选择 **Layer 2 Tunneling Protocol (L2TP)**。
diff --git a/docs/clients.md b/docs/clients.md
index b0e6b92..65bc6da 100644
--- a/docs/clients.md
+++ b/docs/clients.md
@@ -167,7 +167,7 @@ If you get an error when trying to connect, see Troub
### Ubuntu Linux
-Ubuntu 18.04 (and newer) users can install the network-manager-l2tp-gnome package, then configure the IPsec/L2TP VPN client using the GUI. Ubuntu 16.04 and 14.04 users may need to add the `nm-l2tp` PPA, read more here.
+Ubuntu 18.04 (and newer) users can install the network-manager-l2tp-gnome package, then configure the IPsec/L2TP VPN client using the GUI. Ubuntu 16.04 users may need to add the `nm-l2tp` PPA, read more here.
1. Go to Settings -> Network -> VPN. Click the **+** button.
1. Select **Layer 2 Tunneling Protocol (L2TP)**.